Calculating machine



Dec. 8, 1942. AVERY 2,304,329

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CALCULATING MACHINE Original Filed June 12, 1936 12 Sheets-Sheet 4 FIG. E

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H. T. AVERY CALCULATING MACHINE Original Filed June 12, 1936 FIIEL'7.

12 Sheets-Sheet 5 Dec. 8, 1942. H. T. AVERY 2,304,329

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Dec. 8, 1942.

H. T. AVERY CALCULATING MACH INE Original Filed June 12, 1936 FlE ll- 12 Sheets-Sheet 7 1942- H. T. AVERY 2,304,329

CALCULAT ING MACHINE Original Filed June 12, 1936 12 Sheets-Sheet 9 Hill mm gwue/wtm HAPOLD TAvEPY Dec. 8, 1942.

FIE-El- H. T. AVERY CALCULATING MACHINE Original Filed June 12, 1936 12 Sheets-Sheet 10 Original Filed June 12, 1936 12 Sheets-Sheet 11 FIG. E25

3mm HAROLD TAVEPY Dec. 8, 1942. H T, AVERY 2,304,329

CALCULATING MACHINE Original Filed June 12, 1936 12 Sheets-Sheet l2 HAROLD T Av -12v Li I Patented Dec. 8, 1942 CALCULATING MACHINE Harold T. Avery, Oakland,

Mai-chant Calculating corporation of Californi Calif., assignor to Machine Company, a a

Original application June 12, 1936, Serial No.

84.927. Divided and th 1940, Serial No. 351,375

3 Claims.

This invention relates to calculating machines and more particularly to a novel control mechanism for subtraction and negative multiplication operations.

A primary object of the invention is to facilitate control of negative multiplication operation in a calculating machine for effecting short-cutting, et cetera.

A further object of the invention is to automatically latch a depressed control key for the duration of the operation of mechanism controlled by the key and thereafter to disable the latching means until the return of the key to its normal position.

A further and more specific object is the provision of a novel key latching mechanism of general application.

The present application is a continuation-inpart of the copending Avery application, entitled Calculating machines, filed September twentythird, 1935, Serial Number 41,671, and since matured into Patent Number 2,253,748, issued on August 26th, 1941; and is a division of the copending Avery application entitled Calculating machines, filed June twelfth, 1936, Serial Number 84,927, and since matured into Patent Number- 2,27l,240, issued on January 27, 1942. Reference is had to the latter of said patents for a disclosure of a complete calculating machine embodying the present mechanism not specifically described herein.

The machine in which the present invention is illustrated is of the rotary, continuous motion type wherein the registering mechanism is maintained constantly in throughout the period of operation of such actuator. However, the invention may also be ap plicable to other types of calculating machines and, furthermore, although particularly applicable to control of negative or short-cut multi- '1 plication control, certain details of the invention may be applied to the control of different mechanisms.

Referring to the accompanying drawings forming a part of this specification:

Figure 1 is a plan view of a machine embodying the present invention, showing the keyboard, carriage and several controls including the short cut key.

Figure 2 is a section in side elevation illustratii ing the keyboard for selecting a value and a portion of the actuator mechanism.

Figure 3 is a section taken along the line 33 in Figure 2 showing the typical construction and mounting of a key.

invention and including I1 mesh with its actuator I is application August 4,

Figure 4 is a sectional detail of a keyboard check dial.

Figure 5 is a section taken generally along the line of 55 of Figure 2, illustrating the arrangement of the keyboard and the actuator mechanism.

Figure 6 is a sectional view through one of the selection plate assemblies.

Figure 7 is a side elevation of the reverse unit and its controlling mechanism.

Figures 8 and 9 are side elevations of portions of the mechanism for controlling operation of the setting clutch.

Figure 10 is a side elevation of portions of the mechanism for controlling operation of the main clutch.

Figures 11 and 12 are side elevations, partly in section, illustrating the carriage dipping mechanism and certain controls therefor.

Figure 13 illustrates details of the mechanism utilized to control release of the carriage from its dipped position.

Figure 14 is a detail view showing the restore clutch and mechanism for controlling this clutch.

Figure 15 is a section taken on a line I5l5 in Figure 14 illustrating the construction of the spring link.

Figure 16 is a schematic view showing the various units insofar as their relationship to the driving means therefor is concerned.

Figure 17 is a slide elevation illustrating the mechanism for determining single or plural cycle operation selectively.

Figure 18 is a vertical section of the multiplier unit illustrating the manner in which selection may be made of a multiplier value,

Figure 19 is a detail view of the selection segment illustrated in Figure 18.

Figure 20 is a section taken on line 2020 of Figure 18.

Figure 21 is a vertical sectional view of the multiplier unit.

Figure 22 is a sectional detail showing mechanism for automatically controlling the termination of a multiplication operation.

Figure 23 is a section taken on the line 23-23 of Figure 22.

Figures 24A and 24B illustrate details 01' the construction of certain levers illustrated in Figure 21.

Figure 25 is a detail sectional view showing the stop key and the short-cut key mechanism embodying the present invention.

Figure 26 is a vertical section illustrating a short-cut key and its associated mechanism.

Figure 27 is a similar section of the short-cut key illustrating certain interlocking mechanism operable in connection therewith.

Manually set selection mechanism The machine disclosed in the above identified Avery Patent 2,271,240 is of the key set type in which means are provided for first setting one factor of a calculation upon a keyboard or equivalent mechanism, and subsequently operating the machine in a manner determined according to the character and amount of another factor of the calculation.

The mechanism for setting up the first factor may be considered as comprising a manually operated and a power operated portion, the manually operated portion being designed to be moved to a selected controlling position by the depression of keys or the setting of equivalent mechanism, and the power operated portion being designed to be brought into operation immediately prior to the operation of the calculating mechanism and to act under the control of the manually set mechanism to move elements of the calculating mechanism to the proper position to cause operation thereof to enter the value set up on the keyboard.

In a machine designed for calculation in the decimal system, the keys are preferably arranged, as shown in Figure l, in a series of banks of ten keys each, the number of banks provided in each machine depending upon the magnitude of the factors with which the machine is designed to deal.

As shown in Figures 2 and 3, each key section comprises the usual number of keys I00, which are slidably mounted in a channel-shaped key frame I M and normally maintained in raised position by suitable coil springs I02. The key stems I03 are assembled into the channel frame IOI (see Figure 2) by insertion from the top, the slot in the upper side of the channel member IOI being of sufficient width to pass the projection I04 of the key stem, but the registering slot in the lower side being of lesser width, preventing the key stem from dropping through and being also adapted to contact projection I04 to provide a limiting stop in operation of the mechanism.

After insertion of the key stems, strip I05 is secured in place by means of screws I06, thus blocking a portion of the upper slot and preventing withdrawal of the key stems. Strip I05 also carries a strip I01 of rubber or other resilient material against which projections I04 abut when the key stems I03 are pressed upward by their springs. This serves to diminish the noise ordi narily incident to the release of the keys from their latching means and their return to raised position.

Each key section is mounted in the machine between members I08 and I09 which extend between the side plates of the mach ne.

Disposed underneath the value keys one to "nine inclusive, is a differentialy settable bar I20 (Figure 2) which is pivotally suspended from the key section frame IOI by means of two parallel links I28 and I29. This bar I20 has nine identical notches I30, each of which has at its bottom a downwardly extending slot I3I adapted to receive the end of a key stem I03. The vertical center lines of the key stems I03 are spaced an equal distance apart. This distance, however, is slightly greater than the spacing between successive slots I3I so that each succeeding slot I3I will be spaced one increment further away from its cooperating key stem. This spacing is proportioned in such a way that depression of a value key will cam the bar I20 to the rear, a number of increments equal to the value represented by the depressed key.

Movement of each bar I20 is utilized to set up a mechanical representation of the selected value whereby the calculating mechanism may be accordingly controlled as hereinafter set forth. A swinging segment member I32 is mounted upon a common shaft I31 which supports like members associated with other key banks. This member is provided at opposite ends with arcuate racks I38 and I39, which serve to transmit the movement of the differential bar I20 respectively to a check dial assembly I40 positioned on shaft I in alignment with similar dials associated with the other key sections so that the value set up on the entire keyboard may be read on a straight line of dials, and to a cam unit I46, having a series of cams each comprising high and low points which are angularly displaced relative to the corresponding points on an adjacent cam. Cam unit I46 is thus positioned by such movement so as to form a mechanical representation of the number set up whereby the calculating mechanism may be controlled as set forth in the above identified Avery application, Serial No. 84,927. This cam unit I46 is driven through a gear I5I forming a portion of the unit (Figure 2), the gear being in mesh with rack I39 on segment I32. The segment I32 and the selection bar I20 are connected by means of a slot and pin connection I63 so that the segment is rocked directly about the shaft I31 upon depression of any key. Upon release of a depressed key, the return spring I64 (Figure 2) acts to return cam unit I46 associated therewith, and the check dial, to zero position.

After the setting of the mechanism heretofore described has been completed, and upon manipulation of one of the operating controls, the power operated portion of the selection mechanism is brought into operation prior to operation of the calculating mechanism, and acts, under control of the cam units I46, to move elements of the calculating mechanism to the proper position to condition it for effecting entry of the value set up on the keyboard into the accumulator.

This mechanism comprises three shafts I66, I61, and I68 (Figures 2 and 5), hereinafter referred to as the half, quarter, and twelfth speed shafts, respectively, which shafts are common to all orders of the machine. The shafts are connected to the prime mover through gearing and a cyclic clutch, hereinafter described, so that shaft I66 rotates through 180 for each cycle of operation of the machine, and shaft I61 rotates through for each cycle of operation of the machine, while shaft I68 moves through 30 for each cycle of operation. A series of sleeves I66 (Figures 2 and 6), one for each decimal order, is freely mounted on a common pivot shaft I10 disposed between the shafts I66, I61, and I66, and each sleeve has keyed thereto several spaced gears for transmitting driving movement to the several orders of the registering mechanism, as hereinafter described.

Means are provided for selectively locking each of the several sleeves I66, or connecting each so that it will be driven by shaft I66, shaft I61, or shaft I68 at any of nine different rates with respect to the main clutch, said rates corresponding to'the values delineated upon keys I00. Since this mechanism, which is duplicated in each decimal order of the machine, is fully described in the above identified Avery application, Patent 2,271,240, only a brief description of its operation will be necessary for an understanding of the present invention. Five selection plates I12, I18, I84, I90, and I96 (Figures 2 and 6) are pivotally suspended on sleeve I69 in each order and each has mounted thereon a pair of entrained gears as at I13 and I14, the latter meshing with a gear keyed to the sleeve I69. The gears I13 and I14 have different gear ratios on the different plates.

One of the five plates of each order is positioned during a selecting operation to select a value or zero, the remaining four plates of the order being held in idle position. The value positions are positions in which the plate-carried gears mesh with gears on shafts I66 or I61, while the intermediate positions are those in which no such connection is effected. Thus, by way of example, if a six is to be selected, plate I12 will be swung to the left in Figure 2, to engage its gear I13 with gear I15 on shaft I66, while all the other plates will be positioned in intermediate or idle positions.

This simultaneous setting of the selection plates is effected by power driven mechanism which senses the cam units I46 hereinbefore mentioned. This mechanism comprises a group of five feeler arms 2I0 (Figure 2), one for each of the five plates I12, I18, I84, I90, and I96, and pivotally connected thereto by studs 296. Each arm is provided with a sensing nose 2II adapted to be pressed against the associated cam with which it is in radial alignment. These feeler arms 2I0 are p-ivotally supported on a common shaft 2I3 supported by links 2 I4 pivoted on shaft 2I5 fixed to the frame of the machine, and each feeler arm 2I0 is connected by a link 2I6 with a second feeler arm 2I1 pivotally mounted on a fixed shaft 2I8 supported in the frame, and provided with a sensing nose 2I9 adapted to contact the same cam at a point approximately 180 removed from the point at which it is contacted by nose 2II. This sensing system is actuated by a plurality of pairs of complementary cams 220 and 22I adapted to be driven by means hereinafter described, and cooperating with rollers 222 and 223 on a cam follower 224 pivoted to the frame at 225 and connected by links 226 with shaft 2I3.

In operation, as cam follower 224 is rocked by these cams, shaft 2I3 will be advanced toward shaft H8 and each set of sensing noses 2H and 2I9 will be moved toward the cam ,unit I46 with which it is in radial alignment. If a nose 2H meets a low point I6I of one of the cams, the opposite nose 2I9 will meet the opposite high point I 66, thereby rocking the connected selection plate into its forward position, as viewed in Figure 2. If, on the other hand, a nose 2II meets a high point I60 of one of the cams, the opposite nose 2 I 9 will meet the opposite low point I6I and the selection plate to which arm 2IlI is attached will be moved into its rearward position, as viewed in Figure 2. If, in the third case, a nose 2 meets only an intermediate portion and does not engage either a high or a low point of a cam, the opposite nose 2I9 will do likewise, and the connected plate will be positively positioned in central or neutral position in which its idler will be out of mesh with the gears on both shafts I66 and I61.

To accurately position the cam unit I46 before this sensing operation, a pawl 236 (Figure 2) is mounted on shaft H8 and its lower end is urged by spring 23I against pin 232 on link 2. When link 2I4 is moved, the pawl is thus permitted to engage gear I5I, aligning the unit I46 of which the gear forms a part, and holding it against possible displacement during sensing.

The five cams, composing each selection cam unit I 46, have their respective high and low points so positioned around their peripheries, and are so offset with respect to each other that if one of the feelers 2| I in each order meets either a high or a low point on one of the five cams, the other four feelers 2I I in the same order will not meet either a high or a low point on their associated cams. Thus, in each sensing operation, only one of the five selection plates will be rocked either forwardly or rearwardly, the other four of said plates in that order being maintained in their intermediate, central, or neutral position. Thus, the gears carried by each sleeve I 69 can be operatively meshed only by a single train with one of the gear carried on either shaft I66 or shaft I61, or else locked by pawl 2III By this means, any selection from zero" to nine inclusive, is effected in each decimal order under the control of key I00.

Means are provided for locking the selection plates in the relationship above described, comprising a lock gate 236 (Figure 2) extending across all orders in the machine. The gate is pivoted to the frame of the machine at 231 and engage one of three notches 238 in each selection plate to hold said plate against movement in either direction. All the selection plates are engaged simultaneously, the gate being operated by the setting clutch mechanism hereinafter described after the selection plates have been positioned.

Accumulator mechanism From the foregoing description of the selection mechanism, it is apparent that a number comprising a plurality of figures can be registered upon the several sleeves I69 by differentially driving the gears attached to these sleeves various proportionate distances. However, in order to perform any mathematical computation such as addition, subtraction, multiplication, or division, mechanism must be provided for advancing a superior registering element one extra increment whenever the next lower element has made a complete rotation. This process is known as carrying the tens, in a machine operating according to the decimal system.

In the present machine this function is accomplished by accumulator or product registering mechanism having indicia bearing dials visible through openings 3I8 (Figure 1) and carried in a carriage 256 (Figures 1 and 2) shiftable into a plurality of different positions.

The accumulator register mechanism is set forth in detail in the above identified Avery applications and a brief description of the same and of the driving connections therefor will be sufficient for an understanding of the present invention.

The register mechanism comprises, in part, a shaft 262 (Figure 11) supported by the carriage 256, which shaft serves as a pivotal support for a plurality of plates 266, equi-spaced from each other, and all connected to a common bail 269 at their rear ends. Bail 269 is known as a dipping bail by means of which the entire body of plates 266 can be simultaneously oscillated about shaft 262 during a complete multiplication operation as hereinafter described, in which description the mechanism supported by the plates 266 is referred to as the dipping carriage.

The various denominational units of the accumulator mechanism are supported by the plates 266, each unit forming an assembly between two of said plates. Each unit comprises a dial visible at 3! 8 (Figure 1) and connected by differential mechanism to a corresponding gear 213 (Figures 2 and 11) and to the next lower order dial whereby both digitation and tens carry can be registered concurrently. Gear 2 13 is rotatably mounted on a shaft 210 supported by the plates 266 and meshes continuously with a gear 21! rotatably mounted on a shaft 212 also supported by the plates 266. As the dipping carriage is lowered as described hereinafter, the gears 21l are lowered into mesh with the corresponding gears I89 on sleeves I69 to enable digitational entry to be made into the register.

General calculations drive Power for the various operations of the machine is supplied through a plurality of power transmission devices including a cyclically operable main clutch 428, a cyclically operable setting clutch 430, a restore clutch 100, and a shift unit. To drive these devices, a motor 640 (Figure 16) is mounted within the frame of the machine, and regulated by a suitable speed governing device. A flexible coupling 642 connects the motor drive shaft 643 to an overload release device, as, for example, adjustable slip clutch 644. A pinion 645, driven by the slip clutch, drives the main clutch 428 through a transmission system including gear 646 carrying gear 641 meshed with gear 362, which is in turn engaged with idler 659, which in turn engages and drives the gear M on the main clutch. The main clutch 428, when engaged results in selective directional driving of the half, quarter, and twelfth speed shafts (see also Figure 2) under the control of a reverse unit which engages either gear 459 or gear 451 with the power drive. Thus, as appears under the description of the reverse unit, gears 459 and 451 are selectively driven through the main reverse unit, to drive the half, quarter, and twelfth speed shafts in either of two directions.

The setting clutch gear 430' is driven by gear 648 on the same shaft with gear 362 in the main clutch train. Gear 362 also drives a gear 361 on shaft 6 49 upon which is positioned the restore clutch 100. The shaft 649 therefore rotates whenever the motor operates.

Operation of the setting clutch 430 (Figure 8) is under the control of the machine operator, particularly through the instrumentality of various operation control keys. The control of the clutch 430 is such that, immediately upon depression of one of said keys, the clutch is engaged, clutch dog 394 being raised to release the clutch, start the motor, and permit shaft 43I to be driven. Normally, however, the clutch dog 394, which is supported on shaft 50! and keyed thereto, is held in engagement with the clutch by spring 522.

To permit operation of the setting clutch by the add or subtract keys 800 and 86 respectively, an operating bar 503 (Figure 8) is provided which is adapted to be depressed by either of these keys in a manner set forth in detail in the above identified Avery application Serial Number 84,927. Bar 503 is supported by means of levers 504 and 505 pivoted to a frame plate 506 and 501, respectively, and to the bar at 508 and 509, respectively, and is normally held in raised position by spring 5l0, exerting tension on the lower end of lever 504.

So that lowering of the bar 503 may rock the clutch dog 394, a bell crank H2 is pivoted to the lever 505 at 5I3, and provided with a notched arm 5|4 which overlies a lateral extension 5I5 on clutch dog 394 when the bell crank is in the position in which it is normally held by a spring 5|6 tensioned between the other arm of the bell crank and bar 503.

To limit operation of the setting clutch to a single cycle, since this is all that is required to operate the mechanisms actuated by clutch 430, means are provided for returning the clutch dog 394 to cause disengagement of the clutch after half a revolution of the clutch and shaft 43l, even though the control key initiating operation of the clutch 430 is held in depressed position. This includes devices for releasing the clutch dog 394 from hooked arm 5l4 so that the spring may move the clutch dog to effect disengagement of the clutch 430.

The mechanism for effecting this operation includes the reverse cams 550 and 55! (see also Figure 7) on the setting clutch shaft 43], and the rock plate 552 which is rocked by these cams. A crank 520 (Figure 9) is rockable on shaft 50l and is provided with a lateral projection 521 at its forward end adapted to engage the arm 514 and rock the bell crank 5|2 against the tension of spring 5|6 about pin 5|3 to release the lateral projection 5l5 of the clutch dog 394. The opposite end of the crank 52l is bifurcated to embrace a pin 536 on the rock plate 552.

Upon operation of clutch dog 394 by arm 5|4 or by arm I959 as described hereinafter, the clutch 430 is immediately engaged and shaft 43! is rotated. Cams 550 and 55! thereupon rotate and rock the rock plate 552 which, through the pin 536 thereon and crank 520, effects release of the clutch dog 394 which, under the tension of spring 522, is moved to stop the clutch 430 and the shaft 43l upon completion of half a revolution.

The setting clutch operates the power set selection and locking system, and effects the dipping of the accumulator carriage. The main clutch, for driving the actuator, is also engaged by the setting clutch, the two clutches being interlocked so that another setting clutch operation can not be initiated during operation of the main clutch.

For these purposes, the setting clutch controls the operation of a shaft 43!. Mounted on this shaft are a series of cams including dipping mechanism cams, selection setting cams, and main reverse cams, the setting clutch proper, the restore clutch conditioning cam, and the main clutch starting cam.

Main reverse unit For reversing the direction of drive of the elements driven by the main clutch, particularly the direction of rotation of the half, quarter, and twelfth speed shafts, a selectively settable drive reversing unit is provided, the construction of which is described in detail in the above identified Avery Patent 2,271,240.

Subtraction operations are accomplished by reversing the direction of rotation of the half, quarter, and twelfth speed shafts. Means actuated by the setting clutch are therefore provided (Figure 7) which may condition the main drive for reverse operation automatically by operation of the setting clutch 430.

A pendular lever 545 is capable of being acted upon by various control means including the negative multiplication controlling key to cause actuation of the reverse unit and change its setting. The pendiilar lever 545 is hinged on shaft 546, and a reverse unit controlling bar 541 is pivotally connected thereto and supported adjacent its opposite end by a link 548 having a bifurcated end slidable about setting clutch dog shaft 50I. The reverse unit control bar 541 has an upturned end 549 underlying the reverse unit control member 469 hinged on shaft 386, so that whenever shaft 43I is rotated by the setting clutch, and cams 550 and 55I rock plate 552, shelf 553 on said plate will engage and raise the reverse control bar 541 to bring the upper face of its upturned end 549 into contact with one or the other of lugs 554 and 555 (Figure '1) on the reverse unit control member 469.

The reverse unit control member 469 includes a portion 556 having a radial slot 551 therein through which shaft 558 extends to limit the swinging movement of the control unit when it is being set by movement of link 541. Spring 560, as shown in Figure '1, is normally effective to position lever 541 in its rearward position so that it will be raised by cams 550 and 55I, upon rotation of the setting clutch 430 and shaft 43l, to engage lug 555. upon conditioned by member 469 to drive the calculating mechanism in the adding direction.

If the pendular lever 545 is moved to draw reverse bar 541 forward, as by depression of the negative multiplication control key II (Figures 1, 25, 26, and 27), the upturned end 549 of lever 541 is placed beneath cross-tie 554 so that, when the cams 550 and 55I are rotated, the reverse unit control member 468 conditions reverse unit to drive the calculating mechanism in the subtractive direction.

Carriage dipping After selection has been made of the values to be entered into the machine, entry of the values into the accumulator is effected. As previously described, the accumulator is supported by a series of plates 266 (Figure 11) connected by a common bail 269 and pivotally mounted for dipping movement by shaft 262. After selection, plates 266 are rocked about shaft 262 to bring gear 21I in each order into contact with the corresponding intermediate gear I89 (Figures 5, 6, and 11) keyed to sleeve I69 together with gears I1I, I11, and I83. This group of gears I1I, I11, I83, and I89, being keyed to a common sleeve I69 in each order, are rotated as a body at a certain speed and for a certain distance according to the value selected, as has been described in detail in the above identified Avery Patent 2,271,240.

Meshing of intermediate gear 21I with gear I89 in each order, results, upon rotation of gears I89, in the selected value being placed in the accumulator. To secure dipping of the carriage at the correct cyclic time, means operated by the setting clutch are provided for dipping the carriage and thus permitting transfer of the value selected.

The means for dipping the carriage from that position in which it appears in Figures 2 and 11, to bring gears 21I into mesh with gears I89 and then elevate the carriage at completion of the calculation, comprise two vertical sliding links 566 (Figure 11) slidable over pins 561 on opposite sides of the machine. Each link is provided with rollers 568 engaging bail 269, the links being urged upwardly by springs 569. Links 566 are pivoted to cam followers 510 by eccentric studs 512 so as to provide for adjustment of the engagement of gears 2H and I89. Cam followers 510 carry rollers 513 in engagement with cams The reverse clutch is there 514 on setting clutch line shaft 43I so that the links 566 are positively pulled down by the operation of the setting clutch.

Means are provided for latching the carriage in its lower position during engagement of gears 2H and I89. This means includes latch levers 515 (Figure 11) in the form of bell cranks pivoted at 516 and each having a nose 511 formed at the upper end thereof to engage the lower edge of lateral extensions 518 on cam follower levers 510. The latch levers 515 are urged to engage the extensions 518 by springs 519. When the carriage is clipped the extensions 518 ride over the nose 511 and are latched therebeneath thus retaining the carriage in its lowered position until the latch 1evers 515 are operated to release the carriage in a manner presently to be described.

Rocking of shaft 202 to release pawls 20I from gears I89 is accomplished in time with the dipping of the carriage so that release of the gears I89 is properly coordinated with the meshing of gears 21I with gears I89. Keyed to the shaft 202 on each side of the machine are depending levers 586 (Figure 1.2) slotted to receive pins 581. carried at the upper ends of rock levers 588. The levers 588 rock upon shaft 225 and are provided at their lower ends with rollers 589 for engagement by the cam 514.

When the setting clutch rotates the cam 514 to rock the cam follower levers 510, the pawls 20I are thus released except in those orders in which a zero has been set up, as has been previously explained. A detent mechanism which comprises a lever 532 pivoted on a shaft 533 and urged toward clockwise movement by a spring 534, cooperates with a nose 535 formed on the rocking lever 589 to retain it in either of the positions in which it is capable of being set, so that pawls 20I will not reengage gears I89 until the restore clutch operates, as hereinafter described.

Means are provided for releasing the dipping carriage latch lever 515 after the end of main clutch operation. These include (Figure 13) levers 580 and 584 secured to shaft 58I, and cooperating with a lever 59I, pivotally supported on shaft 590 and provided with an extension 592 lying against lever 584. A second extension of lever 59I is adapted to be engaged by a roller 593 fixed between a supporting disc A fixed to sleeve 594 rotatably mounted on shaft 595. This sleeve is driven by a separate clutch operated only as an incident to the termination of operations, and known as the restore clutch.

When the main clutch dog 395 is moved to stop and release main clutch 428 (Figure 10), as will be described hereinafter, the restore clutch starts operation and roller 593 (Figure 13) is rotated. This rocks lever 59I clockwise to move lever 584 and so rocks levers 580 and 539 (Figure 11) to release the latched-down carriage through the rocking of the levers 515 by lateral extensions 583.

As a further incident to the movement of the shaft 58I, roller 536 (see Figures 11 and 12) engages a cam surface 531 on the lower edge of the rocking levers 588 thereby rocking these levers to cause reengagement of the pawls 20I with the gears I89.

The sleeve 594 of the restore clutch 100 carries another cam 596 (Figure 11) which is employed to prevent the carriage from rising too rapidly. Lever 591, fixed to shaft 600, bears against this cam and lever 599 also fixed to shaft 600 is joined by a pin and slot connection 602 to one of the links 566 so that the rate of rise of the carriage under the pull of springs 569 is no greater than that permitted by movement of cam 595.

Main clutch operation The main clutch is engaged and its operation initiated by the setting clutch. Thus, when any one of the operation control keys is depressed, and the setting clutch is started in operation, as has been previously described, the main clutch is automatically engaged, and may be held engaged for one or more cycles of operation, depending on the operation called for by the key depressed.

The main clutch structure has been described in detail in the above identified Avery Patent 2,271,240 and is similar to that of the setting clutch. The main clutch 428 is mounted on the shaft 429 which is positioned between frame plates 524 and BIO of the machine (Figure 16). The clutch is controlled by clutch dog 395 (Figure l) rockably mounted on shaft 6| l and urged into engagement with the main clutch by spring 6l2, tensioned between a frame stud and the left end of the dog through toggle linkage BID.

The rocking lever 146 is fulcrumed on shaft M and carries a roller 145 in engagement with the cam 14'! carried by the setting clutch shaft 43L This rocking lever carries a member 503 pivoted thereon at 604 and urged to rock clockwise with respect to the rocking lever by spring 513, movement between the lever and member being limited by an ear 6M on the member 603 engaging the lower edge of the lever 146. The member 603 is provided with a nose 515 which may engage a notch GIG on clutch dog 395 with a. hooking action to prevent disengagement of these two parts, The movement of member 603 counter-clockwise about shaft l serves to rock dog 395 toward the end of the half rotation of setting clutch shaft 43l, the dog being rocked clockwise, and engagement of the main clutch 428 follows. Further rotation of cam 141 permits return of the rocking lever (46 to the position shown in Figure 10 and permits clutch dog 395 to contact with and stop the clutch when it is freed from the holding means, hereinafter described, which can selectively latch the dog 395 for a plurality of cycles.

Main clutch control To provide for controlled continuous rotation of the cyclic main clutch for multiple cycle operation, as in multiplication, a latch 632 pinned to shaft 626 and urged clockwise by spring 633, has a notch at its upper end to engage under a lateral projection 620 on the tail of the main clutch dog 395. A roller 634 is carried by the latch 532 in a position to form the engaging face of the notch, thus facilitating engagement and disengagement of the clutch dog therewith. The clutch dog will be so latched out of engagement with the clutch only on multicyclic operation, but for operation performed in one cycle of the main clutch, such as multiplication with the number 1 as a multiplier, meat- 5 hereinafter to be described will prevent the latch 632 from entering under the tail of the main clutch dog.

Restore clutch The restore clutch (Figure 14) is employed to efiect the release of the carriage latch member 515 (Figure 11) and to control the rate of the return of the carriage from its dipped position, as well as certain functions hereinafter described in connection with multiplication. This clutch is jointly controlled by the dipping carriage and by the main clutch dog, in such a way that whenever the carriage is in its lower position and the main clutch dog 395 is seated home in the notch of the main clutch, the restore clutch will open and complete one cycle of operation.

The lowering of the carriage creates a spring bias tending to move the clutch release dog away from the restore clutch and permit engagement of the restore clutch, but as this dog is normally latched by member 10! (Figure 14), the spring is prevented from becoming effective until completion of the main clutch cycle. The raising of the carriage is initiated and controlled by the restore clutch and this carriage movement is utilized to reverse the spring bias on the restore clutch release dog so as to tend to return it home so that as the restore clutch cycle is finished, the clutch release dog is spring pressed into the full cycle notch of the clutch housing, bringing the restore clutch to rest upon the completion of one cycle of operation.

The clutch particularly employed is similar to that disclosed in the patent to Friden, Number 1,643,710. This clutch, which is mounted upon and driven by shaft 649 (Figure 14), is directly controlled by an extending nose 102 on a clutch release dog in the form of a bell crank 405 which is freely supported on a shaft 600. For controlling the clutch release dog, an M-shaped member 103 is provided which has one foot rockably mounted on the shaft 600, and a lug 104 thereon, supporting a spring 105 compressed between itself and the left arm of bell crank 405.

An arm 122 keyed to the shaft 600, and thus rocked by dipping movement of the carriage, is resiliently connected to the M-shaped member 103 by a link unit 123 shown in detail in Figure 15. As appears in this figure, the link structure includes a first link member 106 secured by a pin 109 to the arm 122, and another link HI secured by pin H2 to the M-shaped member 193, the other ends of each link being slotted as at H3 to receive the pins 109 and H2, respectively.

' Each link has a cut out portion into which two tenons H4 and H5 extend, the respective tenons being of different lengths so that a column support is provided for the spring H6, slipped over the adjacent tenons in each link, so that when the unit is pulled apart, the spring is compressed. Likewise, when the overall length of the unit is reduced, the spring is also compressed so that the spring tends to maintain the link at a given and constant length while being continuously supported by the overlapping tenons.

As the setting clutch rotates, the main clutch dog 395 is withdrawn from contact with the main clutch and an extension 408 on said dog is withdrawn from beneath latch member 'HH pivoted on a frame plate, thus permitting said latch member to be rocked counter-clockwise by its spring H1 tensioned between one end thereof and the frame. An ear H8 on said latch member is thereby brought into the notch H9 of the M- shaped member 103 to prevent counter-clockwise movement of 103 until the main clutch has been disengaged by reseating of its dog 395 in one of the full cycle notches of the clutch 428.

The lowering of the clipping carriage, however, tends to engage the restore clutch even before the main clutch engages, and a second restraining means is provided to prevent such operation.

The left foot of M-member 103 is provided with a shelf overlying one end of a bell crank 'I2l x u I which is rockably supported on shaft 6| I. The other end of bell crank 12I is provided with a roller 101 lying against the periphery of a cam 108 on the setting clutch shaft 43I. On rotation of the setting clutch, therefore, the bell crank 12I is rocked and shelf 120 is raised by the end of the bell crank to rock the M-shaped member 103 slightly clockwise about the shaft 600. This raising of the member 106 insures that the lug 1I8 of the latch member 10I will engage in the notch 1I9 properly when the main clutch is engaged.

As the setting clutch continues to rotate, the dipping carriage is lowered and shaft 600 is rocked counter-clockwise by arms 599 (see also Figure 11) keyed thereto and connected with the carriage lowering links 566. Arm 122 (Figure 14) keyed to the shaft 600, is thus lowered, and since the M-shaped member 103 is held by the latch member 10I, the link unit 123 is lengthened and its spring 1l6 compressed.

The parts remain so positioned until the main clutch dog 3951s permitted to reseat in the notches of the clutch discs, whereupon the extension 408 thereof strikes the ear 1l0 of the latch member 10 I, rocking it clockwise and removing its lug 1 I B from the notch 1I9 of member 103. Spring H6 is then permitted to expand, shortening the link unit 123 and rocking the member 103 counterclockwise to carry the left leg (Figure 14) of member 103 down against the leftwardly extending arm of bell crank 405 and move the restore clutch dog 405 to cause engagement of the clutch.

Operation of the restore clutch thus initiated, causes the clipping carriage to rise, as previously described, rocking arm 122 clockwise by virtue of its connection therewith. Movement of the arm 122 is, in this operation, transmitted directly through the link unit 123 to rock member 103 clockwise, and to compress spring 105 until the nose 102 of the restore clutch dog 405 can reenter the aperture of the housing to disengage the clutch, whereupon the mechanisms are brought to rest in the position shown in Figure 14.

Automatic multiplier unit The present machine includes a bank of automatic multiplier keys 200i which is shown in Figure 1 adjacent to the right hand side of the machine, and under control of which automatic positive and negative multiplications can be effected. This unit includes a key section 2002 (Figures 18 and 21) which is quite similar to that employed for setting a factor of a calculation, and disclosed in connection with Figure 2.

In the present machine, the key section 2002 is placed adjacent to the right hand side of the machine, as appears in Figure 1. However, the mechanism set thereby is placed adjacent the multiplicand keyboard and between the said keyboard and the plus and minus keys in Figure 1. The key section 2002 (Figure 18) includes the usual differentially settable bar I which is set by the multiplier keys of the 2 to the 9 values to move the selection segment member I32 mounted on shaft I31. The machine being normally conditioned for single cycle operation, no control of the multiplier selection by the 1 key is necessary. The member I32 is substantially like the same member disclosed in Figure 2, except that it does not have the upper segment arm there shown for setting a check dial.

The mechanism for swinging the member I32 is illustrated in Figures 18, 19, and 20. A lever 2003 is pivotally mounted on a shaft 2004 which extends to the left from the key section 2002. A pin 2005 connects the lower end of lever 2003 with differentially settable bar I20 and on its uper end lever 2003 is pivoted by an eccentrically adjustable pin 2006 to a lever arm 2001. This lever arm 2001, as appears in Figure 20, is integral with an arm 2063 welded to a bail member 2064 pivotally mounted on shaft 2004. One end of the bail member is extended to form another lever arm 2065 having a bifurcated end embracing pin 2008 mounted upon the multiplier selection segment I32. Thus the lever 2003 and the lever 2065 are in effect joined as a single lever to rock together about the common axis of the shaft 2004 so that movement of the bar I20 will impart proportional movement to the selection segment I32.

As has been disclosed in connection with the manually set selection mechanism, the swinging member I32 is likewise effective to rotate a. selection cam unit I46 similar to that described hereinbefore.

The multiplier unit also includes sensing members 2l0 and 2I1 (Figure 18) which, in the same way as has been disclosed in connection with the earlier described power set selection mechanism, are effective to sense the setting of the present cam unit I46 and, when the selection gate 236 is released to position plates I12, I18, I84, and I90, cooperating with driven gears 2009 (Figures 16 and 18.) driving idler 20I0 which in turn drives gear MI I. The gears 2009 are keyed to sleeve 20I2 supported by shaft I10, and the sleeve 20I2 is in turn driven by the twelfth speed shaft I68 (Figure 22) through a gear train including gear 2025 on the twelfth speed shaft I68, idler gear 2026, and idler gear 2021, driving gear 2028 on the sleeve 20I2. Since the twelfth speed shaft is rotated Whenever the main clutch is open, gears 20II (Figure 18) are driven thereby through idlers 20I0 carried on the settable plates I12, I18, I84, and I90. As has been developed in connection with the previously described power set selection mechanism, any one of the group of plates may be selectively moved to engage the gear 20H carried thereby with gears which, in this case, are carried by sleeves rotatably mounted on the half or quarter speed shafts. Movement of these gears is utilized to control the number of cycles of operation of the main clutch and thereby to effect a positive or negative multiplication in all operations wherein the multiplier value is two or more. As will presently appear, rotation of the driven sleeve is utilized to disengage the main clutch after the predetermined number of main clutch cycles has occurred.

The driven sleeve rotatably mounted upon the half speed shaft I66 (Figure 23) carries gears 20I3, 20H, 20I5, and 20I6 connected thereto as a unit. The driven sleeve rotatably mounted upon the quarter speed shaft I61 carries gears 20I1, 20I8, and 20I9 connected together as a unit. These gears are mounted upon the half and quarter speed shafts for the sake of convenience and are not connected thereto, the shafts providing merely a convenient support. Gear 2020 is also rotatably mounted upon the quarter speed shaft but is not connected to the sleeve carrying gears including 20I1, IOI8, and 20I9. As typical of the gears which may be used, the gears 20I3 to 20I6, respectively. include gears having twelve, fourteen, sixteen, and eighteen teeth, while the gears 20I1 to 2020, inclusive, include gears having twenty, sixteen. twelve, and

twelve teeth, respectively. The ratio of these gears to the gears driving them is such that gears I3 to 20I9, inclusive, respectively provide selection ratios extending from a nine multiplier to a three multiplier, while the gear 2020, as will presently appear, provides in combination with other mechanism, the two selection.

Depending upon the selection which has been made. one of the plates is swung either to the right or to the left, as viewed in Figure 18, to engage one of the gears in the group 20I3 to 2020, inclusive. The three other plates remain in that position shown in Figure 18 in which gears 20II are not meshed with any gear in the group 20I3 to 2020, inclusive.

A single cam member 202I (Figures 22 and 23) is attached to the sleeve carrying gears 20I3 to 20I6, inclusive, and, as will presently appear, is adapted to rock a bell crank 2022 universally pivoted on the frame by means of a loose fitting pin and spring connection 2029 so as to open the main clutch and stop the machine as hereinafter described, after the cam member 202I has made a single rotation in either a clockwise or a counterclockwise direction. Thus, for example, gear 20 I4,

which is that providing for seven main clutch actuations, and controls a positive or negative multiplication by the value seven, makes one rotation while the main clutch i making seven rotations. Since member 202I is connected to the unit which includes gear 20I4, it will likewise make one rotation and at the end of this rotation is effective to rock the bell crank 2022.

A double cam member 2023 (Figures 22 and 23) is included in the same unit with gears 20II, 20I8,

and 20I9, and is effective upon half a rotation in either clockwise or counter-clockwise direction, to rock the same bell crank 2022. Thus, for example, gear 20I8 is effective to control the multiplication, either positive or negative by the value four, the main clutch making four rotations. During the four main clutch rotations, gear 20I8 and the member 2023 make but half a rotation, the direction depending upon positive or negative multiplication. At the end of this half rotation, the member 2023 is effective to rock the bell crank 2022. Gear 2020, providing for multiplication by the value two. is connected to the triangular cam member 2024 adapted to cooperate with a roller 207'! on the upwardly extending arm of bell crank 2022. This member is adapted, when gear 2020 is being driven, to rock the bell crank 2022 during the second cycle of main clutch operation.

Depression of any value key from 1 to 9 inclusive in the multiplier unit, is effective to effect engagement of the setting clutch, and is also effective to initiate motor operation by closing a motor switch.

The multiplier key section also includes a bar 2030 (Figure 21) which is in a position to be engaged by the stem of any key of from 1 to 9 value inclusive, and is mounted for parallel movement by swinging levers 2044 pivotally connected to its opposite ends. A spring 2032 connected to an extension of the forward lever 2044, urges these levers clockwise, thus normally maintaining the bar 2030 in a raised position. The levers 2044 carry extensions I900 between which extensions is pivoted a stabilizer link I90I. This stabilizer link swings with the bar 2030 to prevent any play in the pivotal connection thereof which might result in other than perfect parallel movement upon depression of the various multiplier keys which contact the bar 2030 at spaced points throughout its length.

In order to close the motor switch and initiate motor operation upon depression of a multiplier key, th bar 2030 is provided adjacent its right hand end with an underlying shelf I902. The shell I902 is engageable upon downward movement of the bar 2030 with a lever I903 which, when depressed by shelf I902, closes a motor circuit in a manner described in detail in the above identified Avery application Serial Number 84,927, to energize the motor 640 (Figure 16).

The mechanism for opening the setting clutch upon depression of any multiplier key from 1 to 9 includes a link 2033 (Figures 21 and 2413) which is pivoted at its right hand end at I908 to an ear of the bar 2030, and is supported adjacent its left hand end by a link I! depending from a lever 2034, included in a lever system which comprises lever 2034, lever 2035, and lever 2036. The levers 2034 and 2035, as shown in detail in Figure 24, are pivotally mounted upon a common pin 2031 supported by a depending portion of the key frame. The lever 2035 is pivoted at I906 to the lever 2035. Lever 2034 and 2035 include, respectively, projections 2038 and 2039 between which a spring 2040 is compressed to urge the levers apart. Similarly, lever 2036 includes a projection 204I while lever 2035 includes a projection 2042, between which projections spring 2043 is compressed. A lug 2045 on lever 2035 limits the movement of lever 2036 and a lug 2I I6 on lever 2035 limits the movement of lever 2034 with respect thereto. Lever 2035 includes an car 2046 which lies beneath the bar 2030 and which is forced downwardly when the bar 2030 is depressed upon operation of a multiplier key1 Depression of the 0 multiplier key also rocks lever 2035 downwardly by means of a lever 2090 which underlies the zero key stem, being pivoted at 209I, and carries a pin 2093 overlying the left end of lever 2035.

It is desired to cause engagement of the setting clutch upon complete depression of any 1 to 9 multiplier key, and to prevent the initiation of operation before depression of such a key has been fully completed. Therefore, the final trip-off of the setting clutch is placed under joint control of the bar 2030 and the key latching mechanism.

Setting clutch operation is initiated by lowering of the link 2033 (Figure 21) by means presently to be described. The link 2033 underlies an ear 2048 formed on an upwardly extending arm of a long lever 2041 pivoted at I909 and urged to swing counter-clockwise about its pivot by a spring I956. The lever 2041 has a rearwardly extending arm I950 provided with a slot II embracing a pin carried by a floating interponent I952 which is supported at one end by arm I953 freely pivoted on a stud I954 on the control plate, an ear I955 being provided on the arm I953 to abut the top edge of the control plate to limit the clockwise swinging movement of the link.

When the link 2033 is lowered, it permits the lever 2041 to be swung counter-clockwise by its spring I956, raising the interponent I952 to a position where it may be engaged by a ratchet wheel I951 secured to a shaft which. is rotated by a gear 362 (Figures 16 and 21) whenever the motor 640 is in operation.

The ratchet I951 will thereupon kick the interponent I952 sharply to the left so that its opposite end strikes a stud I958 on a lever I959. The lever I 959 (as also shown in Figure 8) is keyed to shaft 50I with the setting clutch dog 394 and secured relative to the dog so that such 

